The Mariposa super mutants are a variety of super mutants common on the West Coast and in the Midwest that originated from the Mariposa Military Base in California. While some of them can be rather stupid, in general, they are more intelligent and civilized than their distant Huntersville, Institute, and Vault 87 cousins found in Appalachia, the Commonwealth, and the Capital Wasteland respectively. Their skin is also darker than that of their east-coast counterparts. The Mariposa strain is unique in that the mutants created by it do not continue to grow in size as they age, unlike the East Coast strains.
Average Mariposa super mutants stand approximately 10.5 feet (3.2 m) tall (although they typically stand with hunched backs that reduce their height) and weigh around 800 pounds (363 kg), possibly even more. The Vault 87 super mutants stand approximately over 8 feet (2.44 m) tall and the Institute super mutants are approximately 7 feet (2.13 m) tall. Their skin color is predominately grayish-green in the case of Mariposa mutants and yellow with tints of red and green in the case of Vault 87 ones, although some mutants with other skin colors also exist. Their skin is extremely tough, and their muscle and bone structure are enhanced well beyond the human norm.
Super mutants like these guards are fearsome enemies, possessing great strength and endurance, and powerfully armed with heavy weapons. Incredibly dangerous, both at long range and in close combat, such enemies are not to be underestimated.